I think it depends on the scope of what's being addressed as "IQ". As far as I know, there are some fairly robust methods and results around IQ, but it's usuall

I think it depends on the scope of what's being addressed as "IQ". As far as I know, there are some fairly robust methods and results around IQ, but it's usually hard to make the leap from those to a sales pitch for any particular product/service/policy/program in a similarly robust way. So any given invocation of IQ in the wider world has a high likelihood of being somewhere between scientifically sketchy and outright nonsensical. It's reminiscent of quantum mechanics and epigenetics in that sense.